Hugh f



(No Model.)

" H. I. LYLE.

PLOW POINT AND GOLTER.

No. 272,2 3. 7 Patentd Peb.13, 1883.

" UNITED STATES PATENT OFFICE;

.HUGH F. LYLE, OF STAUNTON, ASSIGNOR OF ONE-THIRD TO WILLIAM S.

HUMPHRIES, OF VESUVIUS, VIRGINIA.

PLOW-POINT ANDQCOLTER.

SPECIFICATION forming part ofLetters Patent No. 272,283, dated February13, 1883.

Application filed November 3,1882. (No model.)

Staunton, in the county of Augusta and State of Virginia, have inventeda new and useful Improvement in Plow-Points and Oolters, of which thefollowing is a full, clear, and exact description, reference being hadto the ann exed drawings, forming part of'this specification.

The object of this invention is to provide a detachable colter for aplow, which may be secured in position without any other means thancontact with the plow-point; and the invention consists of the novelconstruction hereinafter described and claimed. 1

In the drawings, Figure l is a side elevation of part of a plow, showingmy invention as it appears from the mold-boardside. F-i g. 2 1s anelevation of the colter and plowpoint, showing the bevel lap -jointconnection, the same being partly in section; and Fig. 3 is the colterdetached.

Heretofore where points and colters have been made in separate pieceseach has been provided with a bolt or other fastening to secure it inposition. For instance, the colter has been constructed with a lug whichis adapted to be fitted in a recess in the point, and with a flange forconnecting it to the bolt of the mold-board, or with a projection to fitin a mortise in the plow-beam. The flange or the projection in such caseis provided as aspecial means for securing the colter in position. Now,in my invention the colter is so constructed that when the plow-point isbolted in position it will overlap the lower end of the colter, and bindit firmly to the breast or standard of the plow in such manner that itcannot be removed without detaching the point. One bolt or fastening isthus made to secure both the colter and plow-point in place.

The plow-point, which is designated by A in the drawings, is recessed ata in its under side, and the colter B is likewise recessed at b in itsupper surface to form a lap-joint. .The recesses are formed in suchmanner that their overlapping surfaces shall be oblique with respect tothe line of the colter, whereby a bevel lap-joint shall be provided toprevent any longitudinal movement of the colter. The breast or standardagainst which the under surface of the colter is fitted will prevent thecolter from lateral displacement toward the landside, while themold-board forms a close joint with the colter on the opposite side. Thelower end of the colter, at b, is extended laterally toward themold-board O, and is provided with a curve, 0, in the same continuousline with the curve 0 in the upper edge of the point A. With thisconstruction the mold-board fits close into the curve a, and, inconnection with a lug, D, on the point A, which fits in a. recess, E, inthe upper surface of the colter, forms a kind of dovetail joint betweenthe three said parts. Thisjoint adds to the strength of the connectionformed by the bevel lap-joint, while the projection or lug Don the pointA, which isbut a continuation, so to speak, of the lapjoint, serves tobrace the colter against any accidental or other pressure toward thefront.

The projection D is not a necessary feature of :m y invention, and maybe dispensed with, if desired, and the colter may also be formed Withoutthe lateral extension b. I prefer, however, to construct the parts asabove described, since the connection is thereby rendered exceedinglystrong without any appreciable increase of expense over the simplelap-joint.

Having thus described my invention,what 1 claim, and desire to secure byLetters Patent,

1. The combination, with the breast and mold-board of a plow, of theplow-point A, having the recess win its under side, and the colter B,recessed at b in the upper surface and adapted to form a bevel orhalf-dovetail lapjoint witheach other, whereby the colter cannot beremoved when the point'is bolted to the mold-board, substantially asspecified.

2. The combination, with the breast and mold-board of a plow, of theplow-point A, having the lug D, and a recess, a, in its under side, andthe colter B, having recesses b and E in its upper surface, and thelateral extension 1), whereby the colter-shall form a dovetail jointwith the mold board and plow-point and a half-dovetail joint with, theplow-point, substantially as and for the purpose specified.

HUGH F. LYLE.

Witnesses:

A. G. LYNE,

SoLoN O. KEMoN.

